Independent US Healthcare Provider Directory & Public Medical Database
Active NPI 1780903971 Individual Practitioner Male Practitioner

Dr. Daniel M Horn , MD

Internal Medicine • Waltham, MA

Professional Overview & Biography Verified Profile Summary

Dr. Daniel Horn, MD is a registered healthcare professional specializing in Internal Medicine in Waltham, MA. Practice services are available at 221 CRESCENT ST STE 202 under active NPI credentials.

Frequently performed procedures and clinical services include established patient outpatient office visit, subsequent hospital care with moderate levelof medical decision making, if using time, at least, initial hospital care with moderate level of medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

221 Crescent St Ste 202

Waltham, MA 024533425

Telephone 8668490692
Associated Practice Facility / Clinic

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Waltham, MA

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 26.8 Yrs
State Avg: 29.3 Yrs
Regional Practice Density
34 Specialists

Practicing in Waltham, MA (7127 Statewide)

Telehealth Adoption Rate
29.4% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
74.8% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2023)
Reporting Year:
HCPCS Code & Description Services Patients Submitted Charge Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
161 125 $406.94 $104.01
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
87 64 $599.00 $151.19
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
53 24 $438.92 $126.45
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
12 12 $805.00 $184.32

Medical Specialties & State Licenses

CMS Verified: 2026-06-11
Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License MA 251716

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License GA 100333

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License TX U8885

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License CO DR.0072398

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License SC 91509

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License IL 036.168528

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License AL MD.48112

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License HI MD24268

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License OH 35C.001303

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License AZ 72732

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License NC 2024-01822

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License FL ME166617

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License TN 70584

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License PA MD484408

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License OR MD218918

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Secondary Practice Locations

15 Parkman Street, Wac 612

Boston, MA 021143117

Phone: 6177262374

1055 Howell Mill Rd Nw Fl 8

Atlanta, GA 303185557

Phone: 8668490692

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

40 Associated Practitioners
Rachel Starr , FNP-C

Nurse Practitioner - Family

NPI 1003202037

Family Nurse Practitioner (Certified)

Maurine Sachs , APRN, FNP-C

Nurse Practitioner - Family

NPI 1003271040

Advanced Practice Registered Nurse, Family Nurse Practitioner (Certified)

Dr. Megha Patel , MD

Family Medicine - Geriatric Medicine

NPI 1013398486

Doctor of Medicine (M.D.)

Anup Desai , FNP-C

Nurse Practitioner - Family

NPI 1013498989

Family Nurse Practitioner (Certified)

Delaney Brummer , PA

Physician Assistant

NPI 1013508258

Physician Assistant

NPI 1013572338

Advanced Practice Registered Nurse, AGPCNPBC

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

24 Historical Events
🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) June 11, 2026

Internal Medicine (License #MD484408 in PA)

📍
Updated Practice Location May 26, 2026

Registered at 221 CRESCENT ST STE 202, WALTHAM, MA 024533425 (Tel: 8668490692)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) May 26, 2026

Internal Medicine (License #91509 in SC)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) November 07, 2024

Internal Medicine (License #2024-01822 in NC)

📍
Updated Practice Location October 02, 2024

Registered at 8354 E NORTHFIELD BLVD, DENVER, CO 802383131 (Tel: 8668490692)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) July 09, 2024

Internal Medicine (License #35C.001303 in OH)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) June 14, 2024

Internal Medicine (License #91509 in SC)

👤
Provider Name / Credentials Updated May 06, 2024

Recorded as DANIEL HORN, MD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) May 06, 2024

Internal Medicine (License #036.168528 in IL)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) April 02, 2024

Internal Medicine (License #70584 in TN)

📍
Updated Practice Location February 06, 2024

Registered at 217 ELK AVE STE 2222, CRESTED BUTTE, CO 812249608 (Tel: 8668490692)

📍
Updated Business Mailing Address February 06, 2024

Registered at PO BOX 211699, EAGAN, MN 551213699 (Tel: 8668490692)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) February 06, 2024

Internal Medicine (License #91509 in SC)

NPI Profile Active January 18, 2018

NPI status registered as active in NPPES database

📍
Updated Practice Location January 18, 2018

Registered at 15 PARKMAN STREET, WAC 612, BOSTON, MA 021143117 (Tel: 6177262374)

📍
Updated Business Mailing Address January 18, 2018

Registered at 15 PARKMAN ST, WANG AMBULATORY CARE CENTER 612, BOSTON, MA 02114 (Tel: 6177262374)

👤
Provider Name / Credentials Updated January 18, 2018

Recorded as DANIEL HORN, M.D.

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) January 18, 2018

Internal Medicine (License #251716 in MA)

NPI Profile Active May 27, 2010

NPI status registered as active in NPPES database

📍
Updated Practice Location May 27, 2010

Registered at 75 FRANCIS ST, BOSTON, MA 021156110 (Tel: 6177325500)

📍
Updated Business Mailing Address May 27, 2010

Registered at 75 FRANCIS ST, BOSTON, MA 021156110 (Tel: 6177325500)

👤
Provider Name / Credentials Updated May 27, 2010

Recorded as DANIEL HORN, M.D.

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) May 27, 2010

Internal Medicine (License #244680 in MA)

🟢
Initial NPI Registration & Enumeration May 27, 2010

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

0 Reviews
No patient reviews submitted yet for Dr. Daniel Horn. Be the first to share your experience!

Sign in to leave a review for Dr. Daniel Horn

Only verified registered users can submit ratings, post feedback, and upload facility photos.

NPI Administrative Meta

NPI Number: 1780903971
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: May 27, 2010
Last Update: June 11, 2026
Sole Proprietor: No

Mailing Address

Po Box 211699

Eagan, MN 551213699

Phone: 8668490692

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.